/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 周斌
 * Date: 2023-11-01
 * Time: 12:59
 */
public class Test {
    //对分数相加的优化
    public static void main(String[] args) {
        double sum =0;
        int ret = 1;
        for (int i = 1; i <=100 ; i++) {
            sum += 1.0/i * ret;
            ret = -ret;
        }
        System.out.println(sum);
    }
}
